By David M. Perry
February 3, 2015

In late January, Kristiana Coignard, a seventeen-year-old woman with bipolar disorder and depression, walked into the police department in Longwood, Texas, with "I have a gun" written on her hand. She also had a knife in her waistband. Officer Glenn Derr approached her, read her message, and quickly restrained her. He then let her go, restrained her on the floor, then let her go again as two other officers entered the scene.

When police deal with people in crisis [CNN]